A hot balloon blew up in Egypt. There something wrong with the quality of it.
A. may have been
B. must be
C. need have been
D. might be
网友回答
(答案→)A. may have been
B. must be
C. need have been
D. might be
解析：Ａ考察 情态动词。句义：在埃及的一个热气球爆咋了，可能是热气球的质量出了问题。根据blew可知，此处表示的是过去情况的推测，使用情态动词+have done的形式。故A正确。